Manual:Routing/BFD
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BFD protocol for routing
Requirements
Starting from RouterOS version v4.4, BFD is supported.
Summary
BFD is a protocol intended to detect faults in the bidirectional path between two forwarding engines, including physical interfaces, sub-interfaces, data link(s), and to the extent possible the forwarding engines themselves, with potentially very low latency. It operates independently of media, data protocols, and routing protocols.
Bidirectional Forwarding Detection (BFD):
- hello protocol for checking bidirectional neighbor reachability;
- provides sub-second link failure detection support;
- not routing protocol specific, unlike protocol hello timers or such
Features supported:
- asynchronous mode (draft-ietf-bfd-base-09.txt)
- BFD timer and detection multiplier configuration per interface;
- enabling BFD for OSPF interfaces
- enabling BFD for BGP peers
- single hop IPv4 and IPv6 transport (draft-ietf-bfd-v4v6-1hop-10.txt)
- multihop IPv4 and IPv6 transport (draft-ietf-bfd-multihop-08.txt)
Configuration
BFD configuration should be added in different places as required
OSPF
/routing ospf interface add interface=all use-bfd=yes
BGP
/routing bgp peer add remote-address=x.x.x.x remote-as=xxxxx use-bfd=yes
BFD timer configuration
/routing bfd interface
BFD neighbor status
/routing bfd neighbor